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A127890
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Largest n-digit right-truncatable prime.
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3
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OFFSET
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1,1
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COMMENTS
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For a variant see the Howard reference. - Alexander R. Povolotsky, Dec 23 2007
Right-truncatable means that the integer part of successive divisions by 10 always yields primes (or zero). - M. F. Hasler, Nov 07 2018
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REFERENCES
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Toby Howard, "Magic Pi - The Magic of Numbers", PC Advisor magazine, May 1998.
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LINKS
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Table of n, a(n) for n=1..8.
I. O. Angell and H. J. Godwin, On Truncatable Primes, Math. Comput. 31, 265-267, 1977.
Jens Fehlau, 73939133 - Probably the Most Interesting Prime Number [Part 1] and [Part 2], Flammable Maths videos (2020).
Index entries for sequences related to truncatable primes
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PROG
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(PARI) A127890=vector(8, n, p=concat(apply(t->primes([t, t+1]*10), if(n>1, p))); p[#p]) \\ M. F. Hasler, Nov 07 2018
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CROSSREFS
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Cf. A024770, A050986, A127889.
Sequence in context: A104094 A220382 A036950 * A198973 A127859 A014293
Adjacent sequences: A127887 A127888 A127889 * A127891 A127892 A127893
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KEYWORD
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base,nonn,fini,full
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AUTHOR
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Ray Chandler, Feb 04 2007
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STATUS
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approved
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